Dont get bent outta shape. Its the interwebz. You're making a big claim. Expect skeptics.
If we were in the garage id say "damn, that sounds awesome but better than a 38r? Cmon. Cmon".
The other points raised are strictly questions. You think 1400 deg egts are normal towing? Simple question.
I'd expect egts to climb towing over 10k lbs up a 6% grade for over 8 miles. It would normally climb 1300 while I was rolling but if slower drivers were hanging in the left lane (which they always do) and I really had to lug her, they would climb even more and I wouldn't let her get over 1400. This auto, with 34.5's, and 3.73's. So I end up shifting to third to make everything happy. Same climb same load with the BASB and I never topped 1050 on overdrive. I log tons and tons of miles each week and stay in my gauges. The BASB runs cooler, spools slightly lower, and makes more boost across the board.
My numbers based on the dieselsite d66 ww2.
Running empty at interstate speeds 38r would run about 3-5 psi and 600-650 get on flat ground. BASB will run 5-7 psi stay between 550-600 egt. Empty up standard type hills on the interstate, the 38r would run 7-10 psi and run 750-950 egt. BASB runs 8-12 psi and temps stay between 650-800 egt. Towing my same trailer mentioned above on the interstate on flat ground, 38r runs 7-10psi and 750-1000 egts. BASB runs 8-12 psi and 700-800 egts. Running up standard hills the 38r runs 10-15 psi and 1000-1200 egts. BASB runs 12-17 psi and runs 800-1000 egts.
I run the 38r with the stock wheel, regular ww2 and the d66 ww2. The d66 ww2 was the best performer on my truck which is strictly a daily driver/tow rig. The BASB I have only run with the billet wheel installed by Bell.
My truck is stronger tip to bottom running the BASB and it seems much happier in the 1500-1800 rpm range than the 38r on MY truck.
And FWIW my WG rod was completely tightened down on the 38r.
Here's something else for you. Towing mileage numbers all hand calculated. 38r stock wheel 8.5 mpg, ww2 8.8 mpg, and d66 ww2 9.2 mpg. BASB 10.5 mpg.
Empty, I was about 15 mpg with all 3 wheels on the 38r. BASB I'm just over 16 so far. I use my higher HP tow tune to tow, and my street tune running empty.